Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 311, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 17, 1997, 8:12 AM CDT for Pittsburg County, Oklahoma. It was in force for 63 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 17, 1997, 8:12 AM CDT (13:12 UTC)
- Expired
- Aug 17, 1997, 9:15 AM CDT
- In force
- 63 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Pittsburg County, OK
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 17, 8:45 AM CDT | Hail 0.75 | Kiowa, OK | A severe thunderstorm produced dime size hail 1 mile south of Kiowa. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 1.2 hours before the alert went out and 154 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1963 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 1079 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 407 m²/s²
- 0-3 km storm-relative helicity
- 429 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 171311 RRA SVRTUL OKC121-171415- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 812 AM CDT SUN AUG 17 1997 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 915 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST OKLAHOMA ...SOUTHERN PITTSBURG COUNTY AT 810 AM RADAR INDICATED A SEVERE THUNDERSTORM JUST SOUTH OF ASHLAND MOVING EAST AT 20 MILES AN HOUR. ASHLAND AND KIOWA ARE IN THE PATH OF THIS STORM. HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. DURING THE STORM MOVE INDOORS AND STAY AWAY FROM WINDOWS. TO PROTECT YOURSELF FROM LIGHTNING DO NOT USE THE TELEPHONE OR HAND HELD ELECTRICAL APPLIANCES...UNLESS IN AN EMERGENCY. MOTORISTS SHOULD BE ALERT FOR WATER ON ROADWAYS AND NEVER DRIVE ONTO A FLOODED ROAD.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 17, 4:32 AM CDT, 3 hours 40 minutes earlier.
Area forecast discussion, Aug 17, 4:32 AM CDT, 3 hours 40 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 415 AM CDT SUN AUG 17 1997 TSTMS FROM KS WILL MOVE ACROSS ERN PTNS OF FCST AREA DURING THE EARLY MORNING AND WILL BASE POPS ON THAT...WITH WORDING THAT PCPN WILL BE MAINLY EARLY IN THE DAY. XPC RAIN AND RESIDUAL CLOUDS WILL HOLD TEMPS BELOW THE MOS BY A FEW DEGS AND WILL MAKE THAT ADJUSTMENT. ALSO APPEARS THAT ISENTROPIC LIFT WILL KEEP CLDS AND SOME RW/TRW DVLPG OVR THE COOL DOME OF AIR FROM THE CURRENT MCS. THIS MAY ALSO KEEP TEMPS A LITTLE COOLER TDA. THE SHRTWV ALF THAT HELPED DVLP THE MCS WILL MOVE ON EWD AND SHD ALLOW AMS TO BECOME MORE STABLE AND CONDITIONS TO DRY OUT BY MON AND MONDAY NIGHT. H8 FLOW DCRS LATER TODAY SO CONVERGENCE SHD WEAKEN... REDUCING ANY POS VV. HOWEVER...WITH BNDRY IN THE AREA THRU MON...WILL KEEP AT LEAST A SLGT CHC IN THE FCST. TIME TO GET BACK TO THE RADAR AND MONITOR FOR MORE WARNINGS... FCSTID = 2 TUL 87 71 91 73 / 50 40 20 10 FSM 86 71 92 71 / 60 40 30 10 MLC 91 73 94 73 / 40 30 20 10 BVO 87 69 90 72 / 60 30 20 10 FYV 83 70 89 70 / 80 50 30 10 IDB 93 72 93 73 / 30 30 20 10 BYV 82 68 89 69 / 80 50 30 10 MIO 82 69 88 70 / 70 40 20 10 MKO 89 72 91 73 / 40 30 20 10 F10 86 71 92 73 / 60 40 20 10 .TUL... OK...NONE. AR...NONE.
In the hours before
Special weather statement, Aug 17, 6:10 AM CDT, 2 hours 2 minutes before
ARZ001-002-010-011-019-029-OKZ054>076-171200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 610 AM CDT SUN AUG 17 1997 ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE OVER SOUTHEAST OKLAHOMA AND WESTERN ARKANSAS THIS AFTERNOON. A WEAK COLD FRONT MOVED INTO NORTHERN OKLAHOMA AND NORTHWESTERN ARKANSAS THIS MORNING...BRINGING STRONG TO SEVERE THUNDERSTORMS ALONG WITH IT. WHILE THESE STORMS HAVE WEAKENED...THIS FRONT WILL STALL OVER THE AREA TODAY...GENERALLY ALONG INTERSTATE 40...AND SHOULD SERVE AS A FOCUS FOR ADDITIONAL THUNDERSTORMS IN THE AFTERNOON. ALONG AND TO THE SOUTH OF THE FRONT...HIGH TEMPERATURES AND ABUNDANT MOISTURE WILL COMBINE TO YIELD A MODERATELY UNSTABLE ATMOSPHERE. MAXIMUM LIFTED INDICES WILL RANGE FROM -6 AND -8 BY LATE AFTERNOON. THE VERTICAL WIND PROFILE...WHILE HAVING WEAKER LOW-LEVEL WINDS THAN PREVIOUS DAYS...WILL STILL BE CONDUCIVE TO SUPPORTING ISOLATED SEVERE THUNDERSTORMS. FACTORS LIMITING SEVERE THUNDERSTORM FORMATION WILL BE THE CAP OF WARM AIR ALOFT AND THE UNCERTAINTY OF THE FINAL LOCATION OF THE FRONTAL BOUNDARY. THE CAP WILL BE STRONG THROUGHOUT THE DAY...BUT TEMPERATURES IN THE MID 90S SHOULD BE SUFFICIENT TO BREAK THE CAP. THERE IS STILL SOME QUESTION AS TO THE FINAL RESTING PLACE OF THE FRONT. IF IT MOVES FARTHER SOUTH AND EAST THAN FORECAST...THE SEVERE THUNDERSTORM THREAT WILL ALSO BE FARTHER SOUTHEAST. SPOTTERS AND EMERGENCY MANAGERS IN SOUTHEAST OKLAHOMA AND WESTERN ARKANSAS SHOULD MONITOR THE LATEST WEATHER CONDITIONS AND BE PREPARED FOR POSSIBLE ACTIVATION THIS AFTERNOON. AN UPDATED THUNDERSTORM OUTLOOK WILL BE ISSUED AT 1 PM TODAY.
Special weather statement, Aug 17, 6:13 AM CDT, 1 hour 59 minutes before
ARZ001-002-010-011-019-029-OKZ054>076-171200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 610 AM CDT SUN AUG 17 1997 ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE OVER SOUTHEAST OKLAHOMA AND WESTERN ARKANSAS THIS AFTERNOON. A WEAK COLD FRONT MOVED INTO NORTHERN OKLAHOMA AND NORTHWESTERN ARKANSAS THIS MORNING...BRINGING STRONG TO SEVERE THUNDERSTORMS ALONG WITH IT. WHILE THESE STORMS HAVE WEAKENED...THIS FRONT WILL STALL OVER THE AREA TODAY...GENERALLY ALONG INTERSTATE 40...AND SHOULD SERVE AS A FOCUS FOR ADDITIONAL THUNDERSTORMS IN THE AFTERNOON. ALONG AND TO THE SOUTH OF THE FRONT...HIGH TEMPERATURES AND ABUNDANT MOISTURE WILL COMBINE TO YIELD A MODERATELY UNSTABLE ATMOSPHERE. MAXIMUM LIFTED INDICES WILL RANGE FROM -6 AND -8 BY LATE AFTERNOON. THE VERTICAL WIND PROFILE...WHILE HAVING WEAKER LOW-LEVEL WINDS THAN PREVIOUS DAYS...WILL STILL BE CONDUCIVE TO SUPPORTING ISOLATED SEVERE THUNDERSTORMS. FACTORS LIMITING SEVERE THUNDERSTORM FORMATION WILL BE THE CAP OF WARM AIR ALOFT AND THE UNCERTAINTY OF THE FINAL LOCATION OF THE FRONTAL BOUNDARY. THE CAP WILL BE STRONG THROUGHOUT THE DAY...BUT TEMPERATURES IN THE MID 90S SHOULD BE SUFFICIENT TO BREAK THE CAP. THERE IS STILL SOME QUESTION AS TO THE FINAL RESTING PLACE OF THE FRONT. IF IT MOVES FARTHER SOUTH AND EAST THAN FORECAST...THE SEVERE THUNDERSTORM THREAT WILL ALSO BE FARTHER SOUTHEAST. SPOTTERS AND EMERGENCY MANAGERS IN SOUTHEAST OKLAHOMA AND WESTERN ARKANSAS SHOULD MONITOR THE LATEST WEATHER CONDITIONS AND BE PREPARED FOR POSSIBLE ACTIVATION THIS AFTERNOON. AN UPDATED THUNDERSTORM OUTLOOK WILL BE ISSUED AT 1 PM TODAY.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 3:17 AM CDT | Severe Thunderstorm Warning | TSA | Rogers, Tulsa | 58 min |
| Aug 17, 3:26 AM CDT | Severe Thunderstorm Warning | TSA | Nowata, Washington | 49 min |
| Aug 17, 4:06 AM CDT | Severe Thunderstorm Warning | TSA | Rogers, Wagoner | 69 min |
| Aug 17, 5:13 AM CDT | Flash Flood Warning | TSA | Rogers | 3 hr |
| Aug 17, 7:25 AM CDT | Severe Thunderstorm Warning | TSA | Muskogee | 50 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1997Every severe thunderstorm warning in 1997
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.